—He _______ be here just now. His coffee is still warm.
A:need
B:can't
C:must
D:shouldn't
2+8=____
(新华网):新鲜的节日似乎越来越多,今天,一个原本很平常的日子却被“好事者”冠以“圆周率日”(又称“π节”);更有人建议:应该在今天纪念圆周率鼻祖( )
如图,△ABC内接于⊙O,OD⊥BC于D,∠A =50°,则∠OCD的度数是( )